UCP201 bearing: complete specifications & equivalents
The UCP201 is a JIS B 1559 radial bearing sized 12 x 32 x 31 mm (bore x OD x width) with 2RS sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 12 mm |
| Outer diameter D | 32 mm |
| Width B | 31 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 14.2 kN |
| Basic static load rating C0 | 6.65 kN |
| Fatigue load limit Pu | 0.505 kN |
| Mass | 700 g |
| Housing height H | 30.2 mm |
| Housing overall length L | 127 mm |
| Mounting bolt center distance J | 95 mm |
| Mounting hole diameter N | 13 mm |
| Manufacturer designation | UCP201 |
| Standard | JIS B 1559 |
| Catalog version | CAT. No. 2203-3/E 2024 |
| Last verified | 2026-09-25 |
Source: catalog reference (CAT. No. 2203-3/E 2024) · extracted 2026-09-25
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (CAT. No. 2203-3/E 2024); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & UCP-series range
| Bore d | 0.472 in |
|---|---|
| Outer diameter D | 1.26 in |
| Width B | 1.22 in |
| ISO bore code | 01 |
| Radial section height (D−d)/2 | 10 mm |
| Smallest bore in UCP-series | 12 mm |
| Largest outer diameter in UCP-series | 300 mm |
| Width range across UCP-series | 31–145 mm |
| Bore position in UCP-series (smallest first) | 1 of 25 |
| Bore above smallest UCP-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCP201 | ISO 15 | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the UCP201 model number is decoded
The NTN UCP201 unit pairs a UC201D1 sealed ball bearing insert with a one-piece P203 cast-iron pillow block housing, delivered aligned, greased and ready to bolt down. On the nameplate, UCP201 decodes as a UC wide-inner-ring insert in a P plummer block, 2-series duty, 12 mm bore; the UC201D1 designation shows the D1 greasable execution. Boundary data for the 12 mm bore: housing centre height 30.2 mm, base 127 mm, mounting centres 95 mm for M10 fasteners through 13 mm holes; the UC201D1 insert itself is 32 mm OD. The 2-series section is the standard-duty choice — the slimmest, lightest housing at this bore, selected when shaft speed and load are moderate and space is normal. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 12–20 mm bore these are the light-drive units: small conveyors, packaging machines and appliance-grade equipment, where the cast housing is over-engineered relative to the load but forgiving of imperfect mounts. Renewable-energy biomass handling — chipper infeed, ash drag-out conveyors — uses this unit in pairs, with the locating bearing fixed and the opposite float unit free to slide on its base slots. Relubricate through the fitting while the shaft is turning if at all possible: fresh grease pushes the old charge around the ball set and out past the seals, whereas purging a stationary bearing can rupture the seal lip. Basic ratings of the UC201D1 insert are 14.2 kN dynamic and 6.65 kN static; the assembled UCP201 weighs about 0.7 kg.
Typical equipment & failure modes
Common applications
- small packaging and labelling machines
- appliance and HVAC OEM drives
- food-table and bottle-line rollers
- frequent stop-start and reversing duty such as shuttle and tripper conveyors
Known failure patterns
- water-emulsified grease after washdown with the fitting facing upward
- setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in
- insert brinelling from hammer mounting or from belt tension applied to a stationary unit
Selection pitfalls — read before you substitute
- The lip seals and slingers on UCP201 suit ordinary industrial dust; submerged or heavy slurry service needs a different sealed arrangement regardless of the load rating.
- Never weld a bracket to the P203 housing of UCP201: local heat cracks cast iron and distorts the spherical bore that the insert depends on.
- At 12 mm bore the unit is cheap but the shaft is slender: a bent or undersized shaft, not the bearing, is the usual failure cause for UCP201, so check journal straightness before fitting.
- The standard 2-series insert in UCP201 is the lightest section at 12 mm — do not substitute it into a position that previously ran an X or 3 unit: the 95 mm mounting may match while the load rating does not.
- As a pillow block, UCP201 needs a prepared horizontal surface at the 30.2 mm centre height: shim both feet with full-width packs so the 127 mm base seats over its full area.
Frequently asked questions
How is UCP201 locked to the shaft, and how tight should the setscrews be?
The UC201D1 insert uses two collar setscrews on the 12 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated.
When should I choose a pillow block like UCP201 instead of a flanged unit?
Choose the UCP201 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 30.2 mm above the 127 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
Can I replace just the insert inside an UCP201 unit?
Yes — UCP201 is an assembly of the P203 housing and UC201D1 insert, and the insert can be ordered separately if the spherical seat and feet are undamaged. Clean the seat, coat it with anti-seize, and confirm the setscrew indentations on the 12 mm shaft are not the reason the old insert failed.
What are the dimensions of an UCP201 mounted bearing?
UCP201 takes a 12 mm shaft (insert UC201D1, 32 mm OD) and has a unit mass of about 0.7 kg. Housing figures: centre height H 30.2 mm, length L 127 mm, bolt centres J 95 mm, foot holes 13 mm for M10 bolts.
What does the UCP201 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; 2 is the duty series; the last digits encode the 12 mm bore. UCP201 is built from housing P203 plus insert UC201D1 (D1 = greasable).
Reviewed & verified by the MPN Base engineering desk against source catalog CAT. No. 2203-3/E 2024 on 2026-09-25. Read our editorial & correction policy.